PlaceAccountCancellationOrder_API method does not place Cancelation Order (CL) if account is set on Hold.
Software-related issue #PBA-81160: "PlaceAccountCancellationOrder_API call does not place CL order if the account is on Hold".
Contact firstname.lastname@example.org or TAM to trace the status of the request.
Workaround: use the
CancelAllSubscriptionsForAccount_API method or activate the Account prior to the CL placement.